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US never been in Afghanistan but US troops were about 10 years
This one since 2001.
Since October of 2001.
They've been there since 9/11/2001.
Iraq and Afghanistan.
There are currently about 3 750 french soldiers in Afghanistan. 34 have died since 2001.
338 British troops have died so far in Afghanistan (As of 5/10/10)
SECURITY!
Since 2001, so 13 years as of 2014.
As far as the military goes, October of 2001. The CIA... that's uncertain, but they were certainly active during the 1979 - 1989 Soviet invasion of Afghanistan, and may possibly have been in-country since.
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The US invaded Afghanistan in 2001!